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>  theme

Doesn't really matter as there are themes already available
>  max images per post number

Max images 3 or maybe even 1 as it will look cleaner and won't take up too much of the page.
>  word filters

Nah those are gay.
>  ban what topics/posters

Ban anyone from 4chon.me and ban any talk of posters from there.
>  sticky what

General announcements and/or random funny memes.
>  max replies

250 sounds good.
>  board title (where it says original high brow...)

That's up to the Admin tbh.
>  board tagline

Keep the one that's there already it's good enough.
>  delete what (posts/threads)

Nothing really needs deleting imo.